[POWERPC] pseries: phyp dump: Register dump area
Set up the actual dump header, register it with the hypervisor. Signed-off-by: Manish Ahuja <mahuja@us.ibm.com> Signed-off-by: Linas Vepstas <linasvepstas@gmail.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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1 changed files with 134 additions and 9 deletions
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@ -29,6 +29,117 @@
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static struct phyp_dump phyp_dump_vars;
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struct phyp_dump *phyp_dump_info = &phyp_dump_vars;
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static int ibm_configure_kernel_dump;
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/* ------------------------------------------------- */
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/* RTAS interfaces to declare the dump regions */
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struct dump_section {
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u32 dump_flags;
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u16 source_type;
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u16 error_flags;
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u64 source_address;
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u64 source_length;
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u64 length_copied;
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u64 destination_address;
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};
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struct phyp_dump_header {
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u32 version;
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u16 num_of_sections;
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u16 status;
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u32 first_offset_section;
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u32 dump_disk_section;
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u64 block_num_dd;
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u64 num_of_blocks_dd;
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u32 offset_dd;
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u32 maxtime_to_auto;
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/* No dump disk path string used */
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struct dump_section cpu_data;
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struct dump_section hpte_data;
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struct dump_section kernel_data;
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};
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/* The dump header *must be* in low memory, so .bss it */
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static struct phyp_dump_header phdr;
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#define NUM_DUMP_SECTIONS 3
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#define DUMP_HEADER_VERSION 0x1
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#define DUMP_REQUEST_FLAG 0x1
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#define DUMP_SOURCE_CPU 0x0001
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#define DUMP_SOURCE_HPTE 0x0002
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#define DUMP_SOURCE_RMO 0x0011
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/**
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* init_dump_header() - initialize the header declaring a dump
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* Returns: length of dump save area.
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*
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* When the hypervisor saves crashed state, it needs to put
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* it somewhere. The dump header tells the hypervisor where
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* the data can be saved.
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*/
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static unsigned long init_dump_header(struct phyp_dump_header *ph)
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{
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unsigned long addr_offset = 0;
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/* Set up the dump header */
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ph->version = DUMP_HEADER_VERSION;
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ph->num_of_sections = NUM_DUMP_SECTIONS;
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ph->status = 0;
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ph->first_offset_section =
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(u32)offsetof(struct phyp_dump_header, cpu_data);
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ph->dump_disk_section = 0;
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ph->block_num_dd = 0;
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ph->num_of_blocks_dd = 0;
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ph->offset_dd = 0;
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ph->maxtime_to_auto = 0; /* disabled */
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/* The first two sections are mandatory */
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ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->cpu_data.source_type = DUMP_SOURCE_CPU;
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ph->cpu_data.source_address = 0;
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ph->cpu_data.source_length = phyp_dump_info->cpu_state_size;
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ph->cpu_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->cpu_state_size;
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ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->hpte_data.source_type = DUMP_SOURCE_HPTE;
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ph->hpte_data.source_address = 0;
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ph->hpte_data.source_length = phyp_dump_info->hpte_region_size;
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ph->hpte_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->hpte_region_size;
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/* This section describes the low kernel region */
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ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->kernel_data.source_type = DUMP_SOURCE_RMO;
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ph->kernel_data.source_address = PHYP_DUMP_RMR_START;
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ph->kernel_data.source_length = PHYP_DUMP_RMR_END;
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ph->kernel_data.destination_address = addr_offset;
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addr_offset += ph->kernel_data.source_length;
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return addr_offset;
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}
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static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr)
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{
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int rc;
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ph->cpu_data.destination_address += addr;
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ph->hpte_data.destination_address += addr;
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ph->kernel_data.destination_address += addr;
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do {
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rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL,
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1, ph, sizeof(struct phyp_dump_header));
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} while (rtas_busy_delay(rc));
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if (rc)
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printk(KERN_ERR "phyp-dump: unexpected error (%d) on "
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"register\n", rc);
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}
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/* ------------------------------------------------- */
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/**
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* release_memory_range -- release memory previously lmb_reserved
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@ -107,7 +218,9 @@ static struct kobj_attribute rr = __ATTR(release_region, 0600,
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static int __init phyp_dump_setup(void)
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{
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struct device_node *rtas;
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const int *dump_header = NULL;
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const struct phyp_dump_header *dump_header = NULL;
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unsigned long dump_area_start;
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unsigned long dump_area_length;
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int header_len = 0;
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int rc;
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@ -119,7 +232,13 @@ static int __init phyp_dump_setup(void)
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if (!phyp_dump_info->phyp_dump_configured)
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return -ENOSYS;
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/* Is there dump data waiting for us? */
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/* Is there dump data waiting for us? If there isn't,
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* then register a new dump area, and release all of
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* the rest of the reserved ram.
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*
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* The /rtas/ibm,kernel-dump rtas node is present only
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* if there is dump data waiting for us.
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*/
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rtas = of_find_node_by_path("/rtas");
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if (rtas) {
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dump_header = of_get_property(rtas, "ibm,kernel-dump",
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@ -127,17 +246,23 @@ static int __init phyp_dump_setup(void)
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of_node_put(rtas);
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}
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if (dump_header == NULL)
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return 0;
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dump_area_length = init_dump_header(&phdr);
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/* Should we create a dump_subsys, analogous to s390/ipl.c ? */
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rc = sysfs_create_file(kernel_kobj, &rr.attr);
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if (rc) {
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printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n",
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rc);
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/* align down */
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dump_area_start = phyp_dump_info->init_reserve_start & PAGE_MASK;
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if (dump_header == NULL) {
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register_dump_area(&phdr, dump_area_start);
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return 0;
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}
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/* Should we create a dump_subsys, analogous to s390/ipl.c ? */
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rc = sysfs_create_file(kernel_kobj, &rr.attr);
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if (rc)
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printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n",
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rc);
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/* ToDo: re-register the dump area, for next time. */
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return 0;
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}
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machine_subsys_initcall(pseries, phyp_dump_setup);
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